Research On Activity Characteristics And Activation Technology Of Ni-Cr-Fe Alloy Slag

Cement is a high pollution and energy consum industry, It consume a mass of resource and energy sources. The utilization of various industrial solid wastes as cement admixture addition can largly solve this problem. This dissertation was funded by research project "Technology and Equipment of High Performance Cement Facing Green Manufacturing" from National Supporting Project of eleventh Five-Years Plan of China Under grants No.2006BAF02A24, A lot of studies have been done aiming at activity characterhe, physical properties and activation of this low activity and poor easy-grinding Ni-Cr-Fe alloy slag.In this paper,the waste residues-slag,which are widely applied in the world,are investigated in detail.The reaction degree of the type of waste residues, non-evaporable water and the physical properties of Portland cement-waste residues pastes in the case of different W/B, different amount and different curing ages,are systematically studied.Based on the experimental results mentioned previously,the hydration process of Portland cement-waste residues,the amount,chemical compositions,and microstructure of hydration productions will be analysized in order to better understanding of the positive and negative effects,a reasonable application of industrial wastes.The main solutions are summarized as follows:1. The activity of alloy slag in especial environment were studied. The mechanics properties, physical properties, non-evaporable water and the reaction degree of the waste residues of alloy slag-Portland duality system in the case of different curing ages, different W/B and different amount are systematically studied. The results showed that, the active compositions (active SiO2,Al2O3)in alloy slag increased along with the temperature and the curing ages. however, there was little pertinency between activity ratio and the fineness. The mechanics properties, physical properties, non-evaporable water and the reaction degree of the waste residues of Portland cement-waste residues in different W/B and different amount increased along with the curing ages, but reduced along with the amount of alloy slag. The mechanics properties, physical properties and the reaction degree of alloy slag increased along with the W/B, but non-evaporable water in contrast.2. The mechanical properties of alloy slag-Portland duality system under different activation modes were compared. The physical properties, non-evaporable water and the reaction degree of slloy slag between before activation and after activation were compared. By contrasting the results of mechanical, chemical activation and temperature activation, the optimum approach is to be found. The grindability of alloy slag residue before and after activation along with the grinding time is basically the same trends. But the high-temperature activation improved grindability. The active component of alloy slag before and after activation are basically the same rules, and the activity of alloy slag after activation is high than alloy slag before activation. After activation, the mechanical properties, physical properties, hydration products and the degree of response alloy slag of alloy slag-cement binary system have a large degree of improvement.3. The physical properties, non-evaporable water increased along with the alloy slag increase in the proportion of fly ash, but the reaction degree of slloy slag and drying shrinkage was reduced. After activation, the mechanical properties, physical properties, hydration products and the degree of response alloy slag of alloy slag-fly ash-cement ternary system have a large degree of improvement.